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Laser cooling and trapping offers the possibility of confining a sample ofradioactive atoms in free space. Here, we address the question of how best totake advantage of cold atom properties to perform the observation of as highlyforbidden a line as the 6S-7S Cs transition for achieving, in the longer term,Atomic Parity Violation measurements in radioactive alkali isotopes. Anotherpoint at issue is whether one might do better with stable, cold atoms than withthermal atoms. To compensate for the large drawback of the small number ofatoms available in a trap, one must take advantage of their low velocity. Tolengthen the time of interaction with the excitation laser, we suggest choosinga geometry where the laser beam exciting the transition is colinear to a slow,cold atomic beam, either extracted from a trap or prepared by Zeeman slowing.We also suggest a new observable physical quantity manifesting APV, whichpresents several advantages:specificity, efficiency of detection, possibilityof direct calibration by a parity conserving quantity of a similar nature. Itis well adapted to a configuration where the cold atomic beam passes throughtwo regions of transverse, crossed electric fields, leading both todifferential measurements and to strong reduction of the contributions from theM_1-Stark interference signals, potential sources of systematics in APVmeasurements. Our evaluation of signal to noise ratios shows that withavailable techniques, measurements of transition amplitudes, important asrequired tests of Atomic Theory should be possible in cesium 133 with astatistical precision of 1/1000 and probably also in Fr isotopes for productionrates of 10^6 Fr atoms/s.Comment: 13 pages, 4 figures, 1 tabl

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Prospects for forbidden-transition spectroscopy and parity violation measurements using a beam of cold stable or radioactive atoms